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Hi, I’m Ajay Kumar, an Android Engineer with 4+ years of experience building high-performance Android apps using Java and Kotlin, Jetpack libraries, and RESTful + GraphQL APIs. I specialize in MVVM architecture, Kotlin Coroutines, and modern UI with Jetpack Compose, along with robust dependency management via Dagger Hilt and cross-platform sharing with Kotlin Multiplatform (KMM). I’ve shipped apps to the Google Play Store and enjoy delivering scalable, maintainable code and delightful user experiences. I’m a collaborative team player who has served as SCRUM Master and worked closely with iOS, backend, and QA teams to ensure smooth delivery, strong code quality, and continuous improvement through code reviews and automated testing.…Hi, I’m Ajay Kumar, an Android Engineer with 4+ years of experience building high-performance Android apps using Java and Kotlin, Jetpack libraries, and RESTful + GraphQL APIs. I specialize in MVVM architecture, Kotlin Coroutines, and modern UI with Jetpack Compose, along with robust dependency management via Dagger Hilt and cross-platform sharing with Kotlin Multiplatform (KMM). I’ve shipped apps to the Google Play Store and enjoy delivering scalable, maintainable code and delightful user experiences. I’m a collaborative team player who has served as SCRUM Master and worked closely with iOS, backend, and QA teams to ensure smooth delivery, strong code quality, and continuous improvement through code reviews and automated testing.

Ajay Kumar

App Developer, Back-End Developer, Full Stack Developer, +2

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Hi, I’m Ajay Kumar, an Android Engineer with 4+ years of experience building high-performance Android apps using Java and Kotlin, Jetpack libraries, and RESTful + GraphQL APIs. I specialize in MVVM architecture, Kotlin Coroutines, and modern UI with Jetpack Compose, along with robust dependency management via Dagger Hilt and cross-platform sharing with Kotlin Multiplatform (KMM). I’ve shipped apps to the Google Play Store and enjoy delivering scalable, maintainable code and delightful user experiences. I’m a collaborative team player who has served as SCRUM Master and worked closely with iOS, backend, and QA teams to ensure smooth delivery, strong code quality, and continuous improvement through code reviews and automated testing.…Hi, I’m Ajay Kumar, an Android Engineer with 4+ years of experience building high-performance Android apps using Java and Kotlin, Jetpack libraries, and RESTful + GraphQL APIs. I specialize in MVVM architecture, Kotlin Coroutines, and modern UI with Jetpack Compose, along with robust dependency management via Dagger Hilt and cross-platform sharing with Kotlin Multiplatform (KMM). I’ve shipped apps to the Google Play Store and enjoy delivering scalable, maintainable code and delightful user experiences. I’m a collaborative team player who has served as SCRUM Master and worked closely with iOS, backend, and QA teams to ensure smooth delivery, strong code quality, and continuous improvement through code reviews and automated testing.

Available to hire

Hi, I’m Ajay Kumar, an Android Engineer with 4+ years of experience building high-performance Android apps using Java and Kotlin, Jetpack libraries, and RESTful + GraphQL APIs. I specialize in MVVM architecture, Kotlin Coroutines, and modern UI with Jetpack Compose, along with robust dependency management via Dagger Hilt and cross-platform sharing with Kotlin Multiplatform (KMM). I’ve shipped apps to the Google Play Store and enjoy delivering scalable, maintainable code and delightful user experiences.

I’m a collaborative team player who has served as SCRUM Master and worked closely with iOS, backend, and QA teams to ensure smooth delivery, strong code quality, and continuous improvement through code reviews and automated testing.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Javanese

Advanced

Amharic

Intermediate

Bashkir

Intermediate

Work Experience

Android Engineer at Goldman Sachs Group, NJ

January 1, 2024 - November 18, 2025

Developed features using MVVM and MVC patterns with Kotlin Coroutines, Jetpack Compose, Dagger Hilt, KMM, and RxJava; implemented RESTful and GraphQL APIs; designed a caching algorithm using ROOM to reduce network latency and server API calls by up to 70% for beta users. Built complex and adaptable UIs with Compose, Kotlin Flows, and state management. Served as SCRUM Master, collaborating with iOS, web, backend engineers, product managers, and QA to ensure smooth workflow. Migrated major UI components from XML to Compose, followed SOLID principles, and improved performance and maintainability through code reviews and refactoring.

Android Developer at TopHat Software Technologies

December 1, 2022 - December 1, 2022

Managed full SDLC and developed robust Android applications using Java and Kotlin. Implemented MVVM, Navigation Component, Data Binding, RxJava, Dagger, Retrofit, Kotlin, and Coroutines. Optimized startup time by 60% via Lazy loading in Jetpack Compose with Dagger Hilt and Kotlin Coroutines; refactored architecture to CLEAN and MVVM, reducing app size by 40% and increasing user retention by 25%. Engineered NoSQL database schema on Firebase RTD for chats and metadata; achieved 85% unit test coverage with JUnit, Mockito, and Espresso. Built RESTful APIs with Spring Boot; implemented Firebase OTP verification; developed a Node.js + Express backend with AWS, and configured CI/CD pipelines with Jenkins and GitHub Actions.